﻿utils = {
    setParam: function (name, value) {
        localStorage.setItem(name, value)
    },
    getParam: function (name) {
        return localStorage.getItem(name)
    }
}

product = {
    id: 0,
    name: "",
    num: 0,
    price: 0.00,
    imgurl: ""
};
orderdetail = {
    username: "",
    phone: "",
    address: "",
    zipcode: "",
    totalNumber: 0,
    totalAmount: 0.00
}

cart = {
    //向购物车中添加商品  
    addproduct: function (product) {
        var ShoppingCart = utils.getParam("ShoppingCart");
        if (ShoppingCart == null || ShoppingCart == "") {
            //第一次加入商品  
            var jsonstr = { "productlist": [{ "id": product.id, "name": product.name, "num": product.num, "price": product.price,"imgurl":product.imgurl }], "totalNumber": product.num, "totalAmount": (product.price * product.num) };
            utils.setParam("ShoppingCart", "'" + JSON.stringify(jsonstr));
        } else {
            var jsonstr = JSON.parse(ShoppingCart.substr(1, ShoppingCart.length));
            var productlist = jsonstr.productlist;
            var result = false;
            //查找购物车中是否有该商品  
            for (var i in productlist) {
                if (productlist[i].id == product.id) {
                    productlist[i].num = parseInt(productlist[i].num) + parseInt(product.num);
                    result = true;
                }
            }
            if (!result) {
                //没有该商品就直接加进去  
                productlist.push({ "id": product.id, "name": product.name, "num": product.num, "price": product.price, "imgurl": product.imgurl });
            }
            //重新计算总价  
            jsonstr.totalNumber = parseInt(jsonstr.totalNumber) + parseInt(product.num);
            jsonstr.totalAmount = parseFloat(jsonstr.totalAmount) + (parseInt(product.num) * parseFloat(product.price));
            orderdetail.totalNumber = jsonstr.totalNumber;
            orderdetail.totalAmount = jsonstr.totalAmount;
            //保存购物车  
            utils.setParam("ShoppingCart", "'" + JSON.stringify(jsonstr));
        }
    },
    //修改给买商品数量  
    updateproductnum: function (id, num) {
        var ShoppingCart = utils.getParam("ShoppingCart");
        var jsonstr = JSON.parse(ShoppingCart.substr(1, ShoppingCart.length));
        var productlist = jsonstr.productlist;

        for (var i in productlist) {
            if (productlist[i].id == id) {
                jsonstr.totalNumber = parseInt(jsonstr.totalNumber) + (parseInt(num) - parseInt(productlist[i].num));
                jsonstr.totalAmount = parseFloat(jsonstr.totalAmount) + ((parseInt(num) * parseFloat(productlist[i].price)) - parseInt(productlist[i].num) * parseFloat(productlist[i].price));
                productlist[i].num = parseInt(num);

                orderdetail.totalNumber = jsonstr.totalNumber;
                orderdetail.totalAmount = jsonstr.totalAmount;
                utils.setParam("ShoppingCart", "'" + JSON.stringify(jsonstr));
                return;
            }
        }
    },
    //获取购物车中的所有商品  
    getproductlist: function () {
        var ShoppingCart = utils.getParam("ShoppingCart");
        if (ShoppingCart != null) {
            var jsonstr = JSON.parse(ShoppingCart.substr(1, ShoppingCart.length));
            var productlist = jsonstr.productlist;
            orderdetail.totalNumber = jsonstr.totalNumber;
            orderdetail.totalAmount = jsonstr.totalAmount;
            return productlist;
        } else {
            return null;
        }
    },
    //判断购物车中是否存在商品  
    existproduct: function (id) {
        var ShoppingCart = utils.getParam("ShoppingCart");
        var jsonstr = JSON.parse(ShoppingCart.substr(1, ShoppingCart.length));
        var productlist = jsonstr.productlist;
        var result = false;
        for (var i in productlist) {
            if (productlist[i].id == product.id) {
                result = true;
            }
        }
        return result;
    },
    //删除购物车中商品  
    deleteproduct: function (id) {
        var ShoppingCart = utils.getParam("ShoppingCart");
        var jsonstr = JSON.parse(ShoppingCart.substr(1, ShoppingCart.length));
        var productlist = jsonstr.productlist;
        var list = [];
        for (var i in productlist) {
            if (productlist[i].id == id) {
                jsonstr.totalNumber = parseInt(jsonstr.totalNumber) - parseInt(productlist[i].num);
                jsonstr.totalAmount = parseFloat(jsonstr.totalAmount) - parseInt(productlist[i].num) * parseFloat(productlist[i].price);
            } else {
                list.push(productlist[i]);
            }
        }
        jsonstr.productlist = list;
        orderdetail.totalNumber = jsonstr.totalNumber;
        orderdetail.totalAmount = jsonstr.totalAmount;
        utils.setParam("ShoppingCart", "'" + JSON.stringify(jsonstr));
    },
    deleteall: function () {

        localStorage.removeItem("ShoppingCart");

    }
};